"I've never really done anything like this before and I'm a bit nervous about the water, so it was very exciting," she said.

"King River wasn't really accessible for us because we were already visiting Hobart so we were just looking for something close."

Mr Goodwin said they get married next week and were under strict instructions to come back unscathed.

"Rochelle is not allowed to go in the water, we're not allowed to hurt each other," he said.

"Always hold on to the T bar and the pole otherwise you'll get a black eye," Ms Armstrong added.

"The ab workout has been alright, I guess."

The move south has given new guide 20-year-old James Wynwood the break he was been looking for.

"I've been studying for nine months at Tafe and I've been waiting for that opportunity to get out there and get into the industry," he said.

"I've fished along the Derwent with my parents and I know a fair bit about it as well so it's really good for me to be able to take people as a job down the river doing something that I love."

Ms Cordwell-Steane said she hoped water levels in the King River would recover in time to recommence tours in the summer of 2017 and if the gentler experience along the Derwent River proved popular, King River Rafting might permanently expand its tours to both locations.